Improvement in adjustable cams



N PETERS. PHOTO-UTHDGRAPHER. WASHINGTON D C @didnt Sieur imnt j effin,

CHARLES F. ANNAN, OF BOSTON, ASSIGNOR TO HIMSELF AND HERBERT S. MERRILL,OF CAMBRIDGE, MASSACHUSETTS.

Leners Peteur No. 110,537, 1aed December 27; 1870.

I IMPROVEMENT IN ADJUSTABLE CAMS.

The Schedulerefen'ed to in these Letters Patent and making part of thesame.

To all whom it may concern.

Be it known'that I, CHARLES F. ANNAN, of Bos-A ton, in the county ofSuolkand State of Massachw setts, have in vented an Adjustable Cam forproducing variable motion at ditferent intervals of time, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawing making part of this specification, in which-Figure 1 is a perspective View of my adjustable cam.

Figure 2 is a perspective view of the same reversed.

Figure 3 is a vertical section through lthe center of one portion of myadjustable cam. f

My invention has 'orits object to provide an adjustable cam forimparting to various mechanical devices any variable motion desired; andY My invention consists in two hubs revolving'upo'n a shalt, andprovided with one or more arms, the outer ends of which are providedwith enlargements, the

outer sides and surfaces of which contain grooves of the desired formfor imparting to the object or device the particular motion required. v

To enable others skilled inthe'art toun'deistand and use my invention, Iwill proceed to describegthe manner i'n which I have carried it ont.

In the said drawing- A is a shaft, upon which are fitted two e fromwhich project arms a b, the outercnds of which are provided with blocksor enlargements, D E, in the outer faces and ends of which are formedgrooves, ed e f,'of the. desired shape, and into which -project therolls or ends of the levers or other devices to b e actuated thereby.

The inner face of each hub is provided with al short boss or projection,g, of lless diameter than its hub, the boss being planed off' truly, sothat when one hub is revolvedaround the shaft, the surfaces 5 6 of eachhub will snugly coincide and remain in contact with cach other, eachsurface 5 being truly nished oiI" in a plane at right angles to theaxis' of revolution, in ordert-hat when one hub has-been revolvedandsecured `in place by a screw, 7,;12'0 alter the distance between theenlargements D E, any two corresponding points of similar grooves willstill vcontinue to remain in the common plane originally given them, andthe end of the device to be actuated after having been acted on by'orpassed out ofthe groove in one' enlargement, D, will Abe left in theproper position to be takenv up and actuated by the corresponding grooveilnthe otherenlargement E, thereby insuring the to produce any givenresnlt,snch as feeding, holding or releasing, striking or cutting, orother operation or otl'ce required in machines of differentdescriptions. -By providing one or more grooves, c or d, of the samel ordifferent .forms in the outer face of each enlargement D E, and one ormore grooves, e orf, in

each of its ends, or in their under sides where their arms join them, Iam enabled to provide a ready means of securing any number of similar orvariable `motions at different intervals of time.

When it is desired to change the direction of' any particular motion,that is to say, to throw the device operated by the cam from right tolcft, or from one side v to another, it is simplynecessary to unclampthe screw' 7 and revolve the hub C until its enlargement E is revolvedaround so as to come in contact withthe opposite side of the'Aenlargement D, when the. posit-ion of the several portions of thevariousV l grooves, c l e f, will be changed with respect to each other,(see igs. 1 and 2.)

the distance between which may be varied, substantially as and for thepurpose set forth.

Witness my hand this 26th day of November, A.

D. 1870. CHS. F. ANNAN..

Witnesses:

N. W. STEARNS, W. J. CAMBRIDGE.

